Burglar-alarm.



J. F. JENSEN.

BURGLAR ALARM.

APPLICATION FILED JULY 30, 1912.

1,076,373, Patented 00b. 21, 1913.

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nrTnn STATES PATENT easier.

JOHN F. JENSEN, 0F UNION HILL, NEW JERSEY, ASSIGNOR, T0 MARTHA JENSEN, 0F

i UNION HILL, NEW JERSEY.

BURGLAB-ALARM.

Specification of Letters Patent.

Patented Oct; 21,1913.

Application filed July so; 1912. serial in. 712,254.

The object of my invention is to provide a burglar alarm which will be very simple in construction and which will be effective in frightening a burglar off should he attempt to open the door or window to whlch the burglar alarm is applied.

In the accompanying drawings, Figure 1 is a detail view in front elevation of a window with my improved burglar alarm ap-. plied thereto ready to be put in operation, by the raising of the lower window sash? Fig. 2 is a vertical transverse section. in the plane of. the line A.A of Fig. 1. Fig. 3 is a detail transverse vertical section, showing 2 the device applied to a door 1n position to;

be operated by the opening of the door. Fig.

4 is a side view on an enlarged scale, of thei alarm. Fig. 5 18 a longitudinal central section through the same, the parts being in the position which they assume when the car tridge firing hammer is set. Fig. 6 is a similar view, showing the posit-ion which the parts assume when the hammer has been released. Fig. 7 is a view of the pin which is used for releasing the hammer. Figs. 8 and 9 are top and side views of the cartridge and its holder, and Fig. 10 is a view of the removable handle used for resetting the hammer.

The burglar alarm comprises a barrel 1, within which is located a cartridge firing hammer 2. A coil spring 3 is located within the barrel 1, which spring has one end permanently attached to the barrel, as at 4, and its other end permanently attached to the hammer, as at 5.

The cartridge is denoted by 6, and may be either a blank cartridge or ball cartridge, as desired.

The cartridge holder is denoted by 7, and it is removably held in position at one end of the barrel 1, by the removable pointed member 8, which member 8 is herein shown as having a screw-threaded engagement with the barrel. The holder 7 is so situated as to present the cart-ridge 6 in position to be fired by the hammer 2, when the hammer is brought into engagement therewith, under the tension of the spring 8. The barrel 1, at

its end opposite to the cartridge 6, is provided with an inwardly projecting arm 9, serving as a device for holding the hammer 2 n its set or retracted position. In the present instance, this arm 9 is provided with an inclined surface 10, with a slight projection 11 arranged to, engage the eye end of a link 12 c. rried by the hammer 2. v

A removable handle 13 is provided for resetting the hammer, which handle is provided with a hook 14 arrangedto be en gaged with the eye 15, at the free end of the link12, for drawing the hammer against the tension of its spring 3, away from the cartridge 6, a suflicient distance to cause the eye 15 to engage and be retained by the arm 9. The hammer 2, when in its set position, may be released for causing it to fire the cartridge, by providing a movable pin 16, slidably mounted in the end of the barrel opposite the cartridge, which pin 16 has a pointed outer, end 17 and a bifurcated inner end 18, the bifurcated inner end embracing the armt), and having inclined surfaces 19 arranged to engage the eye 15 of the link 12, and crowd the eye off the end of the arm 9, when pressure is exerted tending to force the pin 16 inwardly. The barrel is furthermore, provided with a flexible cord 20, which is herein shown as attached to a screw eye 21 carried by the barrel in proximity to the longitudinally movable releasing pin 16.

When this burglar alarm is used in connection with the lower sash of a window, the alarm may be inserted through two staples 22, and slidably supported in said staples with the point of its pin 16 in engagement with some abutment, such, for instance, as the casing, as clearly shown in Figs. 1 and 2. The free end of the cord 20 may be attached to the lower sash, as, for instance, to the fastener on the top rail of said sash. It will be seen that if a burglar attempts to open the sash, the inward pressure exerted upon the pin 16 will cause it to release the link 12 from its arm 9, thereby releasing the spring-pressed hammer 2 and permitting it to strike the cartridge 6 and explode the same. The explosion of the cartridge is intended not only to awaken the occupants but also to frighten the burglar away. Another manner of using the alarm is in con nection with a door. In this instance, the alarm may be used with either end against the door, as may be found desirable. In Fig. 3 I have shown the alarm with the point ed end of its member 8 in engagement with the floor and the movable pin 16 in engagement with the door. Any attempt to open the door will release the hammer and thereby cause it to explode the cartridge.

In using the alarm in connection with a door, the cord 20 may be used for permitting the proper occupants of the house to release the alarm from its position against the door,by leading the cord 20 through the. keyhole to the exterior of the door, or

through any other hole. To facilitate the ready engagement of the hook 1 1 of the handle 13 with the eye 15, for resetting the hammer, I preferably provide the barrel 1, with an opening 23 opposite the eye 15, when the hammer is in its released position.

It is evident that this alarm may be used in various different Ways and that changes might be made in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention; hence I do not wish to limit myself strictly to the structure herein set forth, but

What I claim is:

1. A burglar alarm comprising a barrel, a cartridge holder therein, a spring-pressed cartridge firing hammer movable along withinthe barrel, an arm projecting into the barrel, a link carried by the hammer arranged to engage said arm for holding the hammer set against the tension of its spring and a movable pin operated by pressure eX- erted thereon for forcing the link off the arm to release the hammer.

2. A burglar alarm comprising a barrel, a cartridge holder therein, a spring-pressed cartridge firing hammer movable along within the barrel, an arm projecting into the barrel, a link carried by the hammer arranged to engage said arm for holding the hammer set against the tension of its spring, a movable pin operated by pressure exerted thereon for forcing the link ofl" the arm to release the hammer, and a removable handle arranged to engage the link to draw it back into engagement with the said arm for resetting the hammer.

3. A burglar alarm comprising a barrel, a cartridge holder therein, a spring-pressed cartridge firing hammer movable along Within the barrel, a device for holding the hammer set against the tension of its spring, a movable pin operated by pressure exerted thereon for releasing the hammer and a flexible connection for bringing the alarm under the control of a movable part to move said releasing pin.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this twenty-sixth day of July 1912.

' JOHN F. JENSEN.

Witnesses F. GEORGE BARRY, HENRY C. THEME.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner, of Patents.

' Washington, D. G. 

